can u explain structure of all the phylum's ?
Classification of Phylum Invertebrata:
|
PHYLUM |
CHARACTERISTICS |
EXAMPLES |
|
Porifera |
Simplest multicellular animals with a perforated body. |
Sycon, bath |
|
Coelenterata |
Have a two-layered body wall. |
Hydra, jellyfish |
|
Platyhelminthes |
Small, soft, flattened, unsegmented worms which do not have a body cavity or a coelom. |
Liver fluke, tapeworm |
|
Annelida |
Possess a true body cavity called coelom. |
Earthworm, leech |
|
Nemathelminthes |
The body is long, cylindrical and unsegmented without a body cavity. |
Hookworm, Ascaris |
|
Arthropoda |
Have jointed limbs and an exoskeleton made of chitin. |
Crayfish, crab |
|
Mollusca |
Have a soft, unsegmented body without appendages, with a hard, calcareous shell to protect the soft body. |
Snail, slug |
|
Echinodermata |
The body may be spherical, cylindrical or star-shaped, hard and unsegmented. Possess a spiny exoskeleton. |
Starfish, brittle star |
|
Urochordata |
Triploblastic animals with a coelom which show bilateral symmetry. |
Balanoglossus, Amphioxus |
Classification of Phylum Vertebrata:
|
CLASS |
CHARACTERISTICS |
EXAMPLES |
|
Pisces |
Organisms belonging to Class Pisces are fish which are cold-blooded or poikilothermic animals. |
Shark, dogfish |
|
Amphibia |
Cold-blooded vertebrate animals which have a body divisible into head and trunk. Neck is absent. |
Frog, toad |
|
Reptilia |
The body is divisible into head, neck, abdomen and tail. |
Lizard, snake |
|
Aves |
All birds belong to Class Aves which are warm blooded or homeothermic animals. |
Pigeon, sparrow |
|
Mammalia |
Warm-blooded animals which give birth directly to their young ones. |
Cat, dog |
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